I keep thinking back to how Aaron is seriously bad news if "raised by another". Which they're really emphasizing he has been. Perhaps it's not what he'll do that's so bad, but what Claire will be manipulated into doing as a result....
i interpreted that as being raised by "an Other".
Is that because you don't remember the exact lines or because you chose to ignore them?
Here's what was said:
MALKIN: It is crucial
that you yourself raise this child.
CLAIRE: You mean with Thomas? Is he..
MALKIN: The father of this child will play no part in it's life, nor yours.
CLAIRE: So what exactly are you saying?
MALKIN: This child
parented by anyone else, anyone other than you -- danger surrounds this baby. . .
CLAIRE: Danger?
MALKIN:
Your nature, your spirit, your goodness, must be an influence in the development of this child.
To say that someone besides Claire could raise the baby implies flat out that the psychic was wrong.